Centering-chuck.



G. E. GRBENLEAP & D. H. TEAS.

GENTERING CHUCK.

APPLICATION FILED AUG.14, 1911. A 1,017,968. Patented Feb.20,1912.

vgwa/rd'mwaf Inventors Attorney 'UNrrED sra'rns Parana ormon.

TEAS, 0F NEW HAVEN, CONNECTICUT, ASSIG-NORS T0 PANY, OF JERSEY CITY, NEW JERSEY.

NILES-BEMENT-POND COM- cnN'rERING-CHUCK.

` Specification of Letters Patent.

Application led August 14, 1911. Serial No. 643,861.

To all whom it may concern:

Be it known that we, GEORGE EDWARD GREENLEAF, a citizen of the United States, residing at Plainfield, Union county, New Jersey, and DANIEL HENRY TEAB, a citizen of the United States,'residingl at New Haven, New Haven county, Connecticut, have invented certain new and useful Improvements in Centering-Chucks, of which the following is a specification.

This invention pertains to centering chucks employed in that class of car wheel lathes in which the wheels are turned while on their axle, the axle journals'being centered in rotary spindles in tailstocks while the driving power is applied to the wheeland-axle structure by mechanism disposed around the axle between the wheels.

Our invention is applicable, however, to any type of car wheel lathe in which a wheelandaxle structure is to be centered by chucking devices engaged'n the axle journal.

Our invention will be readily understood from the following description, taken in connection with the accompanying drawing, in which a Figure 1 is a vertical longitudinal section of a portion of a tailstock fitted with our improved centering chuck; and Fig. 2 is an end view of one of the centering jaws shown in conjunction with .the spring ring holding the jaws in association.

In the drawing :-1, indicates the bearing of the tailstock: 2, the hollow tailstockspindle arranged to be rotated and longitudinally adjusted in the bearing, as usual, the outer end of this spindle having its bore providedwith a tapering flare, as usual: 3,

segmental jaws having the outer portions ofl their peripheries tapered to fit the taper Vof the spindle, the bore of the associated jaws being adapted to fit the axle journal; 4, va light open spring ring surrounding the series of jaws, being seated in a peripheral groove in the tapering portions of the jaws; and 5,' the car axle wlth its journal engaged by the bore of the associated jaws.

As thus far described the structure does not constitute a substantial departure from long practice. The spring ring iexible l enough to permit the associated jaws to be opened up, suiiiciently, when out of the lathe, to. permit the jaws to be expanded and slipped over the collar on the end of the axle journal, after which the jaws are allowed to contract upon the journal. Then,when the structure is placed in the lathe and the spindle moved endwise the jaws become forcibly contracted upon the journal, centering the journal in the spindle and binding the journal to the spindle. These wheel-and-axle structures are rather heavy affairs, and, with usual constructions of centering chucks, a somewhat-awkward job is presented when entering the jaw-provided ends of the axle into the spindle, several shoulders presentsPatentedEeb. 20, 1912.

ing themselves to interfere with the ready endwise entrance into the spindles.

In the present case the jaws have a length almost equal to that of the. journal of the axle so that as the spindle is forced endwise 1n contracting the jaws there can be but littlel movement of the jaws endwise vof the journal, which movement wouldl be vliable to marthe journal. The outer end of the tapering {iared bore of the spindle is belled out, as seen in the drawing, and the inner ends -of the segmental jaws 3 are much reduced inV diameter being hardly more than the diameter of the axle collar, The outer portions of the segmental jaws are tapered to t the tapering bore of the spindle, and the exterior of the jaws between their reduced inner end portions and the tapering portion fitting the taper of the spindle conjoin through the medium of an-easy taper. By reason of this construction if, in putting the wheel and axle structure into the lathe, the inwardly moving spindle starts over the axle collar at all, the spindle may then be moved readily to ultimate position, the axle collar and the segmental jaws riding smoothly and interruptedly into the spindle without being interfered with by any interfering shoulder put on either the bore of the spindle or the exterior of the structure ,received within the bore of the spindle.

We claimz- A centering chuck comprising `a hollow spindle having in the end of its bore'a taper-ing flare belled at its outer end, :L cireu groove in said series, of jaws combined sublar series of segmental jaws having n bore" stantmlly as set forth.

adapted to t an axle journal and having :L GEORGE EDWARD GREENLEAF- tapered end adapted to t said tapering DANIEL HENRY TEAS- 5 flare and provided with a peripheral groove, Witnesses as to Greenleaf:

said series of jaws being of reduced di- J. T. MACMURRAY, ameter at its inner end and gradually en- C U. BEITER. l'arging in diameter from such reduction to Witnesses as to Teas: the tapered portion engaging the spindle, LUCLUS B. POTTER,`

10 and a spring ring seated in a peripheral J, L. BLAIR. 

